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FreeBSD-SA-09:07.libc                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Information leak in db(3)

Category:       core
Module:         libc
Announced:      2009-04-22
Credits:        Jaakko Heinonen, Xin LI
Affects:        All supported versions of FreeBSD.
Corrected:      2009-04-11 15:19:26 UTC (RELENG_7, 7.2-PRERELEASE)
                2009-04-22 14:07:14 UTC (RELENG_7_1, 7.1-RELEASE-p5)
                2009-04-22 14:07:14 UTC (RELENG_7_0, 7.0-RELEASE-p12)
                2009-04-11 15:21:11 UTC (RELENG_6, 6.4-STABLE)
                2009-04-22 14:07:14 UTC (RELENG_6_4, 6.4-RELEASE-p4)
                2009-04-22 14:07:14 UTC (RELENG_6_3, 6.3-RELEASE-p10)

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I.   Background

FreeBSD's C library (libc) contains code for creating and accessing
Berkeley DB 1.85 database files.  Such databases are used extensively
in FreeBSD; for example, the system password files (/etc/passwd and
/etc/master.passwd) are normally accessed via their database files
(/etc/pwd.db and /etc/spwd.db).

II.  Problem Description

Some data structures used by the database interface code are not properly
initialized when allocated.

III. Impact

Programs using the db(3) interface to create Berkeley database files may
"leak" sensitive information into database files.  If those files can be
read by other users, this may result in the disclosure of sensitive
information such as login credentials.

IV.  Workaround

No workaround is available, but systems without untrusted local users are
probably not affected (since remote attackers will in most cases not be
able to read such database files).

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the
RELENG_7_1, RELENG_7_0, RELENG_6_4, or RELENG_6_3 security branch
dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 6.3, 6.4,
7.0, and 7.1 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-09:07/libc.patch
# fetch http://security.FreeBSD.org/patches/SA-09:07/libc.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libc
# make obj && make depend && make && make install

NOTE: On the amd64 platform, the above procedure will not update the
lib32 (i386 compatibility) libraries.  On amd64 systems where the i386
compatibility libraries are used, the operating system should instead
be recompiled as described in
<URL:http://www.FreeBSD.org/handbook/makeworld.html>

NOTE: System administrators may wish to rebuild any system database files
which were created prior to applying this patch in case they contain
sensitive information.

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

CVS:

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_6
  src/lib/libc/db/btree/bt_split.c                                1.7.2.1
  src/lib/libc/db/btree/bt_open.c                               1.11.14.1
  src/lib/libc/db/hash/hash_buf.c                                1.7.14.1
  src/lib/libc/db/mpool/mpool.c                                  1.12.2.1
  src/lib/libc/db/README                                         1.1.40.1
RELENG_6_4
  src/UPDATING                                             1.416.2.40.2.8
  src/sys/conf/newvers.sh                                  1.69.2.18.2.10
  src/lib/libc/db/btree/bt_split.c                               1.7.12.2
  src/lib/libc/db/hash/hash_buf.c                                1.7.26.2
  src/lib/libc/db/mpool/mpool.c                                 1.12.12.2
RELENG_6_3
  src/UPDATING                                            1.416.2.37.2.15
  src/sys/conf/newvers.sh                                  1.69.2.15.2.14
  src/lib/libc/db/btree/bt_split.c                               1.7.10.1
  src/lib/libc/db/hash/hash_buf.c                                1.7.24.1
  src/lib/libc/db/mpool/mpool.c                                 1.12.10.1
RELENG_7
  src/lib/libc/db/btree/bt_split.c                                1.8.2.1 
  src/lib/libc/db/btree/bt_open.c                                1.12.2.1
  src/lib/libc/db/hash/hash_buf.c                                 1.8.2.1
  src/lib/libc/db/mpool/mpool.c                                  1.13.2.1 
  src/lib/libc/db/README                                         1.1.50.1
RELENG_7_1
  src/UPDATING                                             1.507.2.13.2.8
  src/sys/conf/newvers.sh                                    1.72.2.9.2.9
  src/lib/libc/db/btree/bt_split.c                                1.8.6.2
  src/lib/libc/db/hash/hash_buf.c                                 1.8.6.2
  src/lib/libc/db/mpool/mpool.c                                  1.13.6.2
RELENG_7_0
  src/UPDATING                                             1.507.2.3.2.16
  src/sys/conf/newvers.sh                                   1.72.2.5.2.16
  src/lib/libc/db/btree/bt_split.c                                1.8.4.1
  src/lib/libc/db/hash/hash_buf.c                                 1.8.4.1
  src/lib/libc/db/mpool/mpool.c                                  1.13.4.1
- -------------------------------------------------------------------------

Subversion:

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/6/                                                         r190940
releng/6.4/                                                       r191381
releng/6.3/                                                       r191381
stable/7/                                                         r190939
releng/7.1/                                                       r191381
releng/7.0/                                                       r191381
- -------------------------------------------------------------------------

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:07.libc.asc
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